curl --request GET \
  --url https://tonapi.io/v2/staking/pool/{account_id}

{
  "implementation": {
    "name": "TON Whales",
    "description": "Oldest pool with minimal staking amount 50 TON",
    "url": "https://tonvalidators.org/",
    "socials": [
      "https://t.me/tonwhales"
    ]
  },
  "pool": {
    "address": "0:48fb0195a7fc7454512377b9bd704503ded27f6e7c4c4a9d136fdab3ef9ec04c",
    "name": "Tonkeeper pool",
    "total_amount": 123,
    "apy": 5.31,
    "min_stake": 5000000000,
    "cycle_start": 1678223064,
    "cycle_end": 1678223064,
    "verified": true,
    "current_nominators": 10,
    "max_nominators": 100,
    "nominators_stake": 5000000000,
    "validator_stake": 5000000000,
    "liquid_jetton_master": "0:4a91d32d0289bda9813ae00ff7640e6c38fdce76e4583dd6afc463b70c7d767c",
    "cycle_length": 123
  }
}

{
  "error": "<string>",
  "error_code": 123
}